Preferences oder andere Idee?

public class SetNumberActivity extends ActionBarActivity {

    Button setNumber;
    EditText writeNumber;
    
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_set_number);
        
        setNumber = (Button) findViewById(R.id.setNumber);
        writeNumber = (EditText) findViewById(R.id.writeNumber);
        
        setNumber.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                
                SharedPreferences appPrefs = PreferenceManager.getDefaultSharedPreferences(SetNumberActivity.this);
                    SharedPreferences.Editor prefssEditor = appPrefs.edit();
                    prefssEditor.putString("writedNumber", writeNumber.getText().toString());
                    prefssEditor.commit();
                
                finish();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.set_number, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

    SharedPreferences prefsGelesen = PreferenceManager.getDefaultSharedPreferences(context);
            String writedNumber = prefsGelesen.getString("writedNumber", null);

            if(ownNumber != null || writedNumber != null ) {
code ...
}

prefs=getSharedPreferences("myPrefs",0);

SharedPreferences.Editor editor = prefs.edit();

editor.putInt("writedNumber",Integer.parseInt(writeNumber.getText().toString()));

editor.commit();

prefs.getInt("writedNumber",0);